PARALLEL LINES AND ANGLES

Angles at a point

The sum of the sizes of the angles at a point is 360°.

• Problems on sum of angles around a point
• Angles around a point worksheet

Adjacent Angles on a Straight Line

Two angles which have same vertex and share a common arm are called adjacent angles

∠PAQ and  ∠QAR are adjacent angles.

• Problems on adjacent angles
• Adjacent angles worksheet

Vertically Opposite Angles

Vertically opposite angles are equal in size.

• Problems on vertically opposite angles
• Vertically opposite angles worksheet

Corresponding Angles

When two lines are parallel lines are cut by a third line, the angles in corresponding positions are equal in size.

• Problems on corresponding angles
• Corresponding angles worksheet

Alternate Angles

When two parallel lines are cut by a third line, then angles in alternate positions are equal in size.

• Problems on alternate angles
• Alternate angles worksheet

Co Interior Angles

When two parallel lines are cut by a third line, co-interior angles are supplementary.

Co-interior are also called as consecutive interior angles.

• Problems on co-interior angles
• Co-interior angles practice worksheet
• Finding the missing angles of transversal
• Parallel lines and transversal worksheet

Complementary and Supplementary Angles

Two angles are complementary, if the sum of their measures is equal to 90. 

Two angles are supplementary angles if the sum of their measures is equal to 180 degrees.

• Problem on complementary and supplementary angles
• Complementary and supplementary angles practice questions
• Word problems on complementary and supplementary angles
• Complementary and supplementary angles worksheet
• Word problems on worksheet